Surveys for damages caused by rapeseed root canker and analysis of climatic factors influencing its epidemics

ZHU Hui-min; GUAN Qing-xia; LI Yong-hong; LIU Han-bing; GUO Zhao-yu; LI Guo-qing; WU Ming-de; YANG Long; ZHANG Jing

doi:10.19802/j.issn.1007-9084.2026070

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Surveys for damages caused by rapeseed root canker and analysis of climatic factors influencing its epidemics

更新时间：2026-11-03

- Surveys for damages caused by rapeseed root canker and analysis of climatic factors influencing its epidemics
- Chinese Journal of Oil Crop Sciences Vol. 48, Issue 5, Pages: 230-239(2026)
- 作者机构：
  
  1.湖北省作物病害监测与安全控制重点实验室，华中农业大学，湖北武汉，430070
  2.陇西县种子站，甘肃陇西，748199
  3.陕西省杂交油菜研究中心，陕西杨凌，712100
- 作者简介：
- 基金信息：
- DOI：10.19802/j.issn.1007-9084.2026070
  CLC： S435.654
- Received：04 March 2026，
  
  Published：25 October 2026
- 稿件说明：
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朱惠敏,管青霞,李永红等.油菜根溃疡病的发生危害调查与影响其流行的气候因子分析[J].中国油料作物学报,2026,48(05):230-239.

ZHU Hui-min,GUAN Qing-xia,LI Yong-hong,et al.Surveys for damages caused by rapeseed root canker and analysis of climatic factors influencing its epidemics[J].Chinese Journal of Oil Crop Sciences,2026,48(05):230-239.
朱惠敏,管青霞,李永红等.油菜根溃疡病的发生危害调查与影响其流行的气候因子分析[J].中国油料作物学报,2026,48(05):230-239. DOI： 10.19802/j.issn.1007-9084.2026070.

ZHU Hui-min,GUAN Qing-xia,LI Yong-hong,et al.Surveys for damages caused by rapeseed root canker and analysis of climatic factors influencing its epidemics[J].Chinese Journal of Oil Crop Sciences,2026,48(05):230-239. DOI： 10.19802/j.issn.1007-9084.2026070.

摘要

油菜根溃疡病是在甘肃省陇西县发现的一种新病害。本研究在2021-2024年调查了油菜根溃疡病的田间症状、危害损失、症状出现的时空动态以及与

L. sclerotioides

侵染的关系，分析了温度对这一病害发生的影响；此外，还监测了苜蓿和小麦上

L. sclerotioides

的发生情况。结果表明，在陇西县高海拔（

2000 m）地区，油菜根溃疡病对白菜型冬油菜可造成毁灭性损失，重病田发病株率达到100%，病情指数达到75.9~97.6。腐烂根组织变黑，凹陷，表面着生大量颗粒状黑色菌核（分生孢子器前体结构），主根严重腐烂时，油菜植株失去返青生长能力。而主根局部腐烂的油菜植株则可以返青生长、开花、结实，腐烂症状和

L. sclerotioides

菌核仅停留在主根上，没有蔓延至茎秆、枝条和角果。季节发生动态的监测结果表明，油菜根溃疡病仅发生在越冬期（2-4月），这一期间以及越冬前期的持续低温（月均气温3.5℃~13.0℃，月均土温5.3℃~15.2℃）可能是诱发其发生的重要因子。从罹病油菜根组织中分离得到135个真菌分离物。形态和分子鉴定结果表明，它们均属于

L. sclerotioides

。此外，在苜蓿和冬小麦根样品中也检测到

L. sclerotioides

的存在。据作者所知，这种真菌在我国苜蓿和小麦上发生尚属首次发现。

Abstract

Rapeseed root canker (RRC) is a newly discovered disease in Longxi County

Gansu Province

China. It is closely associated with infection by a

scomycetous fungus

Leptosphaeria sclerotioides.

However

the epidemiology and damage of the disease on rapeseed growth and development remained unknown. This study characterized the field symptoms and spatiotemporal dynamics of RRC and investigated its damage on growth and development of rapeseed as well as the influence of climatic factors on RRC such as temperature. Additionally

occurrence of

L. sclerotioides

on alfalfa and wheat was monitored. The results showed that in high-altitude areas (

2000 m) in Longxi

RRC caused a devastating loss on recovery growth of rapeseed from overwintering. In severely infected fields

the disease incidence reached 100% with disease indices at 75.9 to 97.6. Infected roots appeared black in color with sunken cankers

and abundant black sclerotia (e.g. precursors of

L. sclerotioides

pycnidia) were produced on roots surface. Plants with severely-rotted taproots lost ability to regrow in spring

while those with partially rotted taproots could resume growth and develop to maturity. However

the rot symptoms and

L. sclerotioides

were limited on the taproots without spreading to stems or pods. Seasonal monitoring revealed that RRC occurred only at overwintering period from February to April. Consistent low temperatures (monthly average air temperatures from 3.5°C to 13.0°C with monthly average soil temperature from 5.3°C to 15.2°C) during that period might be an important factor inducing occurrence of RRC. A total of 135 fungal isolates were obtained from diseased roots

and they were identified as

L. sclerotioides

based on morphology

as well as molecular detection with specific PCR primers and phylogeny based on ITS sequences. These findings indicated that RRC is an important disease for rapeseed seedling overwintering in high-altitude regions of Longxi County. Furthermore

L. sclerotioides

was detected in alfalfa and winter wheat

which might be the first report of this pathog

enic fungus on these two crops in China.

关键词

Keywords

references

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